287997 has 8 divisors (see below), whose sum is σ = 406656. Its totient is φ = 180672.

The previous prime is 287977. The next prime is 288007. The reversal of 287997 is 799782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 287997 - 2⁶ = 287933 is a prime.

287997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2773 + ... + 2874.

It is an arithmetic number, because the mean of its divisors is an integer number (50832).

2²⁸⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

287997 is a deficient number, since it is larger than the sum of its proper divisors (118659).

287997 is a wasteful number, since it uses less digits than its factorization.

287997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667.

The product of its digits is 63504, while the sum is 42.

The square root of 287997 is about 536.6535195077. The cubic root of 287997 is about 66.0383156766.

The spelling of 287997 in words is "two hundred eighty-seven thousand, nine hundred ninety-seven".